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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e87d8c8a0c4794e7b561b797c6831e1b360a72e47825004d94429005637800b4' 
  AND token = '5Cx2JaL2V7NReKe8buJhtw4a7IEicei7NHqk4mumzlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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