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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55be15cc44fd0c19a1687457c472a7039a39cc37828ec111081196ccb1d872c3' 
  AND token = 'EZmY0mxAWItuY39Q3gmFSbJ2Bs9aGUUzpZ2I9Amwb48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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