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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff60fa884a0478a78e1fc4c329b547ccb2d379f3b04117d18aa0c4106be60a01' 
  AND token = 'fhl3shrnQdiTLWqy4lM7p0zsC5d3+OGTpiHw1ONbsF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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