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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23556a6427b60ee4d36c007a1acba0c7e7c70002aaf6514c78fc750988e2e0ea' 
  AND token = 'VH8EQALc059S3DlfpVE2Hmo3t4AbCjvKnqZ6g8ug0S4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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