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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87680feeac5b9d5242102edac5dc3f11978890753ba9f7c6526ef018c73ecb44' 
  AND token = 'jpbgqnGxzuM221wnEZAQw8S3CSUS9iat9Vd12Wbb9Fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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