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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5daa66e57a3668bb2ca4eb59097d14ec804c9282ebd373853501668fdb6f0f7c' 
  AND token = 'S8gjjmvjRkP1+hob/R/S5ST3wgSamLn1RBcff7Z2hns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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