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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f35f8f1079643b50c8bb5483d8369875b0bc30f0a7860003f5730770454fa4ba' 
  AND token = '2MVSQewX+PDrS2MUOKV8hxXSqnb3bfALvjma/rqDRXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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