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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55a7391b42e569749f446e744407e6b336a58ca0f01b5272cc83e65b0927a41e' 
  AND token = 'SLDyI2VNznO30UKkpxeKIl9QsbYWFzKlKA1J69TijFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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