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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16d3cf59628914caa5facfb27621722f44028120fcaf4e2999fba71c2295f12e' 
  AND token = 'lRK/6E5Nvs/YJimNDGQgI/bn6lNCiFeJff63Yrbf9QI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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