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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '559bf9aa4f67754ef91594d966532dd929866b0ae95a02d00dec90199e799187' 
  AND token = 'JwC0pXidkzHGR0TBJ2OpWRm31i8f9Z4JWkuch0GN5QA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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