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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a977ea11f052904c72c7fd8449689e7dd7b8f56d57de893e625ef1ade1d98d24' 
  AND token = 'NnGA11Ixp545WU2pTYA9ghE5iu9HR/IWL1lcnr1t5fU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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