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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e3737c5359aa52a99d096ec690d38b9ecfa4d940b683ae573478eb39b1ccb87' 
  AND token = 'cIDsDYbdO0m19HJ6JJoJOVCqD8+Xy4LLRaE8y7HWTeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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