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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78af9d012bece65472ae91aec72820b752bde1e99c8a6007e0a8a669dd4d130b' 
  AND token = 'P0f3vtB8nKQEQLI7kcMRkmliZbIUEmNtK5CtDhe/CRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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