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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '791d8cdfb2ba11b1796e3bbe8b04e1b38b5f4b76f19f26beac19401d74549785' 
  AND token = 'WHVLjfqMMga8EUDmu5LC4gbeOpy8Ujtuk7zMaijLhkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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