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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '547dee273351b2f911b7f6aac1cb5d2927f56e0855329377e983b2ba3d1f4d3f' 
  AND token = '+EX2qEAejtL16P54yaxm5OyTbcRDPM0JNr6hsu263OA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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