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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bebefd7dbaef926c31c074cb22d1de5a29eb5adbf83ee15d1cb9000427e3aaa' 
  AND token = 'StypiK6QvxI1L1ZGptoydVMV5kfkg2N6al8X+Wflk1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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