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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f038a3fc920ecb3fa446b0fe0b7ae234997d1bd0ca2722e25c0fc81802444ab5' 
  AND token = 'C2BIUsOisXeVYU1os84SAuzZicdh8wxDM2Gi7GwMi5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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