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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5c9f9aa7d0043eaae1228ca6996a60ddcf9952e2b81d472ae68ee0730e3dcce' 
  AND token = 'vQcf3MMNxDk/Csd3534BEWaMPcOneQAzb0NFrxkIpIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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