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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83bbac5bcdd298d0c0fc7617316192517558d4dd663c658c76a32cf8e63df5d3' 
  AND token = 'RiKkZFUzN46h790lxSnSYltMD0T8N2Trn1Cvjc/aUWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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