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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9a438b4a07150e15c88773978b743dbbb3616a2fbb366dc388743dfe49ec782' 
  AND token = '0tgvA/pfyWW6Z5ONG414nmGOspfvFtb0CLzRK6ag7Cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}