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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ba4c3f5d0e5477ac59c7b1e69a205491172c8988a6806698d9878adc71967c7' 
  AND token = '9gW71+Q07UYsNrLaMlaZkYfUSKUzZu8gn+fwTH3n838=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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