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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efeb6cfbd9467192be11b412457d39ce9307d536886dba4c85ea7cac5fb1a200' 
  AND token = 'L1mc6+K8dDk055TUdspQhcuJz3R9u5JWwB3D6StXKCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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