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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75d1178c08e58f821e487ce72caf1887a04b5778a842a6aff4024e1d209876e7' 
  AND token = 'i2l/UoBPfh1ysIHb71ORagR5kwHK5bptyNdY7aJLXgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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