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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3329213ad3b165f3e228faa14c697b3d1086c048108a7ba03d37f361499091a5' 
  AND token = 'Gr1wr16reMn6ExedK/J5htGpi5Ma8qwUUAiYguSZGjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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