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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87c27131dd4a3dbfe2a79e11db6fff45da976c676034348b545d43d0f305eed1' 
  AND token = 'xpDgRx4PK5aZyhuTX238pv7XH6UE1kVLcVyaDwVrOfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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