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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3e95ab8557610411e14bcc51fc622eb545242e11c54962e4b23b168ab92e9d0' 
  AND token = 'wHzdxbeGPjzeSqf/Czaidml1eiGXF/+pCNeM0Jc9R54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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