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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e3889bef9fe30f9b123e893bd6e1bac92a297f310210b6d093cdb20e6e8e1b1' 
  AND token = 'Fm8ut4uRleNstvp2UfuOa2e8Drbdt/W/3AYvsuqB4ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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