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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62f16862e10a175ba70b7ad3b56e5c6629db3d1767b18c05ee082fbd9d85d4e3' 
  AND token = 'bfiK42BhtznCFJtHi0d5UoMPaPBKkrFlljVMkORttSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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