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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '363efe7b7ac5927f4e2e01b586142f1fd53069b757564268ba7a4085ba344b10' 
  AND token = 'hEhhet3+1iuSMOq+67/U3FHSyCxZLWsEg9D6DsjvQos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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