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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '620ee1877cc4ae7e11c178e2700359590af142a653b1cf33f9837b8bd3bc8b3f' 
  AND token = 'vV4IUePI6FflA4xowrUcnUMaelx+AeAbOVhvLAVEpK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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