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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d64d56f0ebbccdaa042f4a6d8e7adb4b0edadc5d2b7f631c4bd292beaedfa6c' 
  AND token = 'FFwWymIM8wdVFeVSe0odIx/+4pF9jrchSu4PqlW9O8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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