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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '717d65202af8de1765c191dd0c34cd40b7e784ae3bc16a65c68ae0906f3b1ed6' 
  AND token = 'c4KqxP6sWjtAKoeJtmwe9Iyhfh2yyQHRqs1z7fuezw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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