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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c7e0d68bbbec91f986de6fac3b2e3b1fcf65ed3d631fa569d69566961e727fb' 
  AND token = 'iiI9zp/kO53cr+VOS1nw7frUkASn/ehXfoYEaDXu5KA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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