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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b02d8ca3c137492826572e830ecc90d65304d5d5477fb9d3220dcb37d2056fcb' 
  AND token = 'TWEh7jUHO5XwaDveyBzUtAEQOeIokxI6qLTsg/V0tTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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