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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cb8d322e4bb51b46c8c0d080d0b78bc8f77449d1b32408b9478d94fdf9f5504' 
  AND token = '5YYjxJxrPn7gRvUg8AF70ok9saCaw2OUcYvQVEh1Bo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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