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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1be652f02043fa74f10901411e529880644d7e04d5e2a334ef726f37d6fb9250' 
  AND token = 'JTS/ShOAc8t3W7YfQfXLPbCBrwB58clzBJoGlZtrs94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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