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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86be1fdb07e69ceb59ecb57339c46abf3d42e74befb1687726e923c0edac3a53' 
  AND token = 'wEeocfsqePu7ymrUUGR8T99KBhKS/akurjb0wE5BJXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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