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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6a84088d741624e778f8e375258dc2e89d8c1e6ce2e50f1dae1cb9e6b8dae6e' 
  AND token = 'q8IT293gs+YRlwrom5cIOalf2lmm3agsbfU4FqGlwxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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