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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b51542a6e1d8ef8a30693ae35019607dc5613163f2d1975f542ff5f2fd701e8' 
  AND token = 'A5QnzTxLVbadww8OR/i+S4Nv5s7y32grZKYAu5Vel7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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