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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fe817edc6a07eff83b98fc9aec5632c124dcae2f91d8b8d6a2c3ddd10e179c8' 
  AND token = 'YSP77gHN0gUSJEgR3ov6dhvIFKc8Qa1X7sjbOuAUb1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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