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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bfdffe028b51328c3d2259d5aef24949a0968d3b5cdc4b39731eac68f7d3bee' 
  AND token = 'D71513hxqLE4J2sSIQPp+Jcw5CxKYDhgQ6v61sQYXyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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