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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06d3c065de92eeedda1cd6147e1e03104cc2014822ca6dbd76cca895550be708' 
  AND token = 'TnedqDtXPc3Nq5WXFYagN7CcCk1l5Vz7e5gXGFVseyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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