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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94139e4f6e82980b786f966963cbd93de14d2f75445b27eef3a03e65b2f13c90' 
  AND token = '+eHng2sMCd5KSYbV0Uh67PoDd7KmOmbY8mUFmU2ougo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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