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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36aeb0e896dfa0c55d24575bd01ca9ef098b6e6e7855dfd1a06e4c419c634396' 
  AND token = 'FU3BSXj/Hfxdi5+AHPAiWxBiv/C316RX1ckC5DP+eS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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