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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37935aaa1a6688829857721d799a336565ae7be73e8c9846c950a3fd208f1b02' 
  AND token = 'ywhYMefaeDR4gCklLLCUFRxyamJR7tnLVRPpPYsP+Qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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