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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d6d04d568a61084e5241050a51e74b96edd83a6bdc81e67ed2e2b420fcf170e' 
  AND token = 't3NFmssvKb/u+6lbqiKACNDsZqWBng+T2IgOFPtVccE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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