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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6053c81477ec95a9f8419f3996f3c7e2987e15d8a286089bca778e2f11e88de2' 
  AND token = 'L6MPbndZjq5AetofvZ4IsxnTxpg1DuE5eJktkkt8/LU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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