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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '861025ff7d95b570e54a38a404e3b234bc3ba2189444065dde2c510929b4a1a0' 
  AND token = '8LdAvivivlK215kZpMzf7Q2LdyLUm0isB1fivzACDRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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