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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af67e84d86d4e6d432e912e0126d62ca5c8e943acddd6fc848db375d0aa5a325' 
  AND token = '9eLnz1kIut9juW/UQ3XTSDMhXUgyLVtaHhJQpXRY9nY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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