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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3948bedf465260ab028e218211137e5c660dc809a5499ed57f2a7c5f0a0f7ccb' 
  AND token = 'L5kXHm1Atx8/yjp6swXFyihNqLnGmLLGEMONWyvytEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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