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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e52fbadae83824b9be3126dd430d49ca1d86526d3bd949b961f2399a21cbc24e' 
  AND token = '8k2OktC9Ja0jQRiX2kc8Y+j0jOYh4tbD5s3aOjlVo64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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