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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c384389a3d26a5d260cc5659121c5b19eca68a53ccae0a329f1aa61bebd8b6e6' 
  AND token = 'De4J3YrqwaYEJ4HL0lGxi0Za1wSik3eLEOOBOczPMwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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