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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a5390bdbd322f10bef781a61d694b27ad9bc5b6d7eb9325fafbae8414153f88' 
  AND token = '2/l7+aPp29hp34vHSr+GxOJN6QodqpznXN2NTBRm+E8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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