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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f579dc027d08083993489a57f6e8602fe21d3978a952770a34aa8e3a2bdfb63c' 
  AND token = 'eB0eg41pZxuMl8PSnxHg2HodV6vxJ+SYx+inaSsa/rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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