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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a70d3cf7fe06c1095a75afb7a969a89e434745a2f915193db25a5e231789dd3d' 
  AND token = 'U34B9XhsgZH01/ywx/Eq7xbc7R4x03Q6ri4V2rhrs8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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