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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a46989bd59d3eabca1015666c5699fa883062c3e261c91469dddd784b620cf60' 
  AND token = 'iQ+bRhsVLXcVKNREnZREM5+NKj0mkij1Q5uppW5wKsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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