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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '633f56d5a57b4daf868734eddefcbfac1a168e4cda2c539a522e9ed89d309450' 
  AND token = 'uAjwtXU80mDZn3tCTW25gTyCCKrbT/gJxwD1s1LG19k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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