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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dd145c3203ceeeb9e97fbad1fa39db8385a41d5e9fe98d8a9eeed7a5b53ff7e' 
  AND token = 'JgSVdbP1IEOltL/J3iPa06+kb3J3gXaS2h65Nsq93uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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