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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b4b637f0902d6d434ca8da7664c143e91b4a52c136959fd813eaabc0712fa62' 
  AND token = 'SJcyjyjme0dGlqc24VDCUe0Rna714QTKzxjlmWEN+JM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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